I have a new "502" in my `70 Chevelle, with a standard transmission. I have a new Optima battery, and 100 amp power master alt. I wired the car with instructions from Mad-electronics, with a terminal block on the firewall, and used relays for the headlights, ignition, fuel pump, and fans. the fans relays and headlights are powered off the horn buss bar. the rest on the terminal block on the fire wall. The voltage sensing wire is also hooked to the ternimal block on the firewall. When I first start the car the volt gague reads 14 volts. When the cooling fans turn on (which take 50 amps) the volt gague drops to 13 and sometimes lower. If I run the stereo, air conditioner, and headlights it will go to 12.I took the car to the local alt shop and had the system checked, they told me that the alt didnt put out enough amperage at idle and would order a new one that produces 140 amps and, recomended I run #2 welding leads from the new alt all the way to the battery, I now have 8 gage wire to the bus bar and the orignal I think 12 gage from there to the battery. The stereo doesnt have an external amp or big wolfers, just a straight c.d. player. Shouldnt this alt handle this amount of accesories? What if I ran the sensing wire to the horn relay where the fans pull all thoes amps, and how many amps can a 100 amp alt produce continually without harm? What do you think about the huge welding leads? This is a longtime business in the area with a good reputation, that recomended these changes. I am not so sure... By the way when I returned from the shop I removed my battery and put it on the charger, the meter went to 6 amps, I dont think it had a full charge, the shop is about a 20 mile round trip. Any suggestions appreciated..